Mathematical Model of High Moisture Content Paddy Drying in Prime Stage
Date Issued
2016
Date
2016
Author(s)
Lin, Yan-Hong
Abstract
The 1st paddy harvest in summer and fall always suffer from typhoons and torrential rain in Taiwan. The ripe paddies could be easily beaten down by heavy rain and strong wind. These paddies were difficult to ventilate and could bud or mold in the wet stack. Therefore, farmers would rush in the harvest when the typhoon or rainy season comes, and deliver the wet paddies to drying center for drying. But the recirculating dryer with poor efficiency for the high moisture content paddies. Increase the energy cost, prolong the drying process and decrease the operation capacity. To solve the problem, it is necessary to investigate the drying phenomenon of high moisture content paddies, and design a specific pre-dryer for the high moisture content paddy. The study using the FEM analysis software COMSOL Multiphysics5.0. Establish a 1-dimension sphere symmetry geometry with heat and mass transfer model to simulate the changes of moisture content and paddy temperature during the thin layer drying process. Comparing with the flow rate at 0.1CMM, 0.3CMM, 0.5CMM and 0.7CMM at 50℃, the changes of moisture content almost identical. The drying rate show higher at higher flow rate at the initial 1 minutes. On the other hand, Comparing with the drying temperature at 40℃, 50℃, 60℃ and 70℃ at 0.3CMM, Condition at higher temperature with higher drying rate, and with 6 minutes more than the low temperature in the constant rate period. In the other word, higher the drying temperature, higher the drying efficiency. The study compared the experimental and the mathematical data in the condition of 60℃，0.3CMM, and the changes of moisture content and drying rate roughly identical between the experiment and model.
Subjects
High moisture content paddy
Thin layer drying
FEM Analysis
Type
thesis
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